/*
   Copyright (C) 2008 Free Software Foundation, Inc.
   Written by Zheng Da.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   The GNU Hurd is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with the GNU Hurd; see the file COPYING.  If not, write to
   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <fcntl.h>
#include <mach.h>
#include <hurd.h>
#include <hurd/ports.h>
#include <hurd/netfs.h>
#include <device/device.h>

#include "ethernet.h"
#include "vdev.h"
#include "device_S.h"
#include "bpf_impl.h"
#include "netfs_impl.h"
#include "util.h"

/* Implementation of device interface */

/*
 * This function is currently running in the multithread environment,
 * it should be protected by locks.
 */
kern_return_t
ds_device_open (mach_port_t master_port, mach_port_t reply_port,
		mach_msg_type_name_t reply_portPoly,
		dev_mode_t mode, const_dev_name_t name, mach_port_t *device,
	 	mach_msg_type_name_t *devicetype)
{
  struct vether_device *dev;
  struct protid *pi = ports_lookup_port (netfs_port_bucket, master_port,
                                         netfs_protid_class);
  if (pi == NULL)
    return D_NO_SUCH_DEVICE;

  /* If the virtual device hasn't been created yet,
   * create it now. */
  if (pi->po->np->nn->ln == NULL)
    {
      extern struct stat underlying_node_stat;
      static int ino_count = 0;
      /* Create a new light node (virtual device). */
      struct lnode *ln = (struct lnode *) add_vdev (pi->po->np->nn->name,
						    sizeof (*ln));
      if (ln == NULL)
	{
	  ports_port_deref (pi);
	  return D_NO_MEMORY;
	}
      memset (&ln->st, 0, sizeof (ln->st));
      ln->st.st_ino = ++ino_count;
      ln->st.st_mode = S_IFCHR | (underlying_node_stat.st_mode & ~S_IFMT);
      ln->st.st_ctime = ln->st.st_mtime = ln->st.st_atime = time (NULL);
      fshelp_touch (&ln->st, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME,
		    multiplexer_maptime);
      pi->po->np->nn->ln = ln;
    }

  dev = (struct vether_device *) pi->po->np->nn->ln;
  if (dev)
    {
      *device = dev->dev_port;
      *devicetype = MACH_MSG_TYPE_MAKE_SEND;
      return 0;
    }
  return D_NO_SUCH_DEVICE;
}

kern_return_t
ds_device_open_new (mach_port_t master_port, mach_port_t reply_port,
		mach_msg_type_name_t reply_portPoly,
		dev_mode_t mode, const_dev_name_t name, mach_port_t *device,
		mach_msg_type_name_t *devicetype)
{
  return ds_device_open (master_port, reply_port, reply_portPoly, mode,
      name, device, devicetype);
}

kern_return_t
ds_device_close (struct vether_device *device)
{
  return 0;
}

kern_return_t
ds_device_write (struct vether_device *vdev, mach_port_t reply_port,
		 mach_msg_type_name_t reply_type, dev_mode_t mode,
		 recnum_t recnum, io_buf_ptr_t data,
		 mach_msg_type_number_t datalen, int *bytes_written)
{
  kern_return_t ret = 0;
  if (vdev == NULL)
    return D_NO_SUCH_DEVICE;

  if ((vdev->if_flags & IFF_UP) == 0)
    return D_DEVICE_DOWN;

  /* The packet is forwarded to all virtual interfaces and
   * the interface which the multiplexer connects to. */
  broadcast_pack (data, datalen, vdev);
  *bytes_written = datalen;
  if(ether_port != MACH_PORT_NULL)
    ret = device_write (ether_port, mode , recnum ,
			data, datalen, bytes_written);
  /* The data in device_write() is transmifered out of line,
   * so the server-side function has to deallocate it. */
  vm_deallocate (mach_task_self (), (vm_address_t) data, datalen);
  return ret;
}

kern_return_t
ds_device_write_inband (struct vether_device *vdev, mach_port_t reply_port,
			mach_msg_type_name_t reply_type, dev_mode_t mode,
			recnum_t recnum, const io_buf_ptr_inband_t data,
			mach_msg_type_number_t datalen, int *bytes_written)
{
  if (vdev == NULL)
    return D_NO_SUCH_DEVICE;
  return D_INVALID_OPERATION;
}

kern_return_t
ds_device_read (struct vether_device *vdev, mach_port_t reply_port,
		mach_msg_type_name_t reply_type, dev_mode_t mode,
		recnum_t recnum, int bytes_wanted,
		io_buf_ptr_t *data, mach_msg_type_number_t *datalen)
{
  if (vdev == NULL)
    return D_NO_SUCH_DEVICE;
  return D_INVALID_OPERATION;
}

kern_return_t
ds_device_read_inband (struct vether_device *vdev, mach_port_t reply_port,
		       mach_msg_type_name_t reply_type, dev_mode_t mode,
		       recnum_t recnum, int bytes_wanted,
		       io_buf_ptr_inband_t data,
		       mach_msg_type_number_t *datalen)
{
  if (vdev == NULL)
    return D_NO_SUCH_DEVICE;
  return D_INVALID_OPERATION;
}

kern_return_t
ds_device_map (struct vether_device *vdev, vm_prot_t prot, vm_offset_t offset,
	       vm_size_t size, memory_object_t *pager, int unmap)
{
  if (vdev == NULL)
    return D_NO_SUCH_DEVICE;
  return D_INVALID_OPERATION;
}

kern_return_t
ds_device_set_status (struct vether_device *vdev, dev_flavor_t flavor,
		      dev_status_t status, mach_msg_type_number_t statuslen)
{
  if (vdev == NULL)
    return D_NO_SUCH_DEVICE;
  return vdev_setstat (vdev, flavor, status, statuslen);
}

kern_return_t
ds_device_get_status (struct vether_device *vdev, dev_flavor_t flavor,
		      dev_status_t status, mach_msg_type_number_t *statuslen)
{
  if (vdev == NULL)
    return D_NO_SUCH_DEVICE;

  return dev_getstat (vdev, flavor, status, statuslen);
}

kern_return_t
ds_device_set_filter (struct vether_device *vdev, mach_port_t receive_port,
		      int priority, filter_array_t filter,
		      mach_msg_type_number_t filterlen)
{
  kern_return_t err;

  if (vdev == NULL)
    return D_NO_SUCH_DEVICE;

  err = ports_request_dead_name_notification (vdev, receive_port, NULL);
  if (err != KERN_SUCCESS)
    goto out;

  err = net_set_filter (&vdev->port_list, receive_port,
			priority, filter, filterlen);
out:
  return err;
}

kern_return_t
ds_device_intr_register (struct vether_device *vdev, int id, int flags,
			 mach_port_t receive_port)
{
  return D_INVALID_OPERATION;
}

kern_return_t
ds_device_intr_ack (struct vether_device *vdev, mach_port_t receive_port)
{
  return D_INVALID_OPERATION;
}
